ocxl: Fix concurrent AFU open and device removal (a58d37bc) · Commits · 戴 / test

If an ocxl device is unbound through sysfs at the same time its AFU is being opened by a user process, the open code may dereference freed stuctures, which can lead to kernel oops messages. You'd have to hit a tiny time window, but it's possible. It's fairly easy to test by making the time window bigger artificially. Fix it with a combination of 2 changes: - when an AFU device is found in the IDR by looking for the device minor number, we should hold a reference on the device until after the context is allocated. A reference on the AFU structure is kept when the context is allocated, so we can release the reference on the device after the context allocation. - with the fix above, there's still another even tinier window, between the time the AFU device is found in the IDR and the reference on the device is taken. We can fix this one by removing the IDR entry earlier, when the device setup is removed, instead of waiting for the 'release' device callback. With proper locking around the IDR. Fixes: ("ocxl: Create a clear delineation between ocxl backend & frontend") Cc: stable@vger.kernel.org # v5.2+ Signed-off-by:

Frederic Barrat <fbarrat@linux.ibm.com> Reviewed-by:

Greg Kurz <groug@kaod.org> Signed-off-by:

Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190624144148.32022-1-fbarrat@linux.ibm.com

drivers/misc/ocxl/file.c

+11 −12

Original line number	Diff line number	Diff line
		@@ -18,18 +18,15 @@ static struct class *ocxl_class;
		static struct mutex minors_idr_lock;
		static struct idr minors_idr;

		static struct ocxl_file_info *find_file_info(dev_t devno)
		static struct ocxl_file_info *find_and_get_file_info(dev_t devno)
		{
		struct ocxl_file_info *info;

		/*
		* We don't declare an RCU critical section here, as our AFU
		* is protected by a reference counter on the device. By the time the
		* info reference is removed from the idr, the ref count of
		* the device is already at 0, so no user API will access that AFU and
		* this function can't return it.
		*/
		mutex_lock(&minors_idr_lock);
		info = idr_find(&minors_idr, MINOR(devno));
		if (info)
		get_device(&info->dev);
		mutex_unlock(&minors_idr_lock);
		return info;
		}

		@@ -58,14 +55,16 @@ static int afu_open(struct inode inode, struct file file)

		pr_debug("%s for device %x\n", __func__, inode->i_rdev);

		info = find_file_info(inode->i_rdev);
		info = find_and_get_file_info(inode->i_rdev);
		if (!info)
		return -ENODEV;

		rc = ocxl_context_alloc(&ctx, info->afu, inode->i_mapping);
		if (rc)
		if (rc) {
		put_device(&info->dev);
		return rc;

		}
		put_device(&info->dev);
		file->private_data = ctx;
		return 0;
		}
		@@ -487,7 +486,6 @@ static void info_release(struct device *dev)
		{
		struct ocxl_file_info *info = container_of(dev, struct ocxl_file_info, dev);

		free_minor(info);
		ocxl_afu_put(info->afu);
		kfree(info);
		}
		@@ -577,6 +575,7 @@ void ocxl_file_unregister_afu(struct ocxl_afu *afu)

		ocxl_file_make_invisible(info);
		ocxl_sysfs_unregister_afu(info);
		free_minor(info);
		device_unregister(&info->dev);
		}

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